07 - Lens Calibration Part 2¶

▶ 07 - Lens Calibration Part 2 — Watch on YouTube

[Music] [Music] now that we've done the scaling of the now that we've done the scaling of the now that we've done the scaling of the focus axis so the motor is correctly focus axis so the motor is correctly focus axis so the motor is correctly turning the lens we need to fill in the turning the lens we need to fill in the turning the lens we need to fill in the other boxes on this lens setup in order other boxes on this lens setup in order other boxes on this lens setup in order to know exactly where the camera is so to know exactly where the camera is so to know exactly where the camera is so correct measurement can be taken the correct measurement can be taken the correct measurement can be taken the first ones we're going to fill in are first ones we're going to fill in are first ones we're going to fill in are the nodal offsets when you're in the the nodal offsets when you're in the the nodal offsets when you're in the cinema sitting in your seat your eyeball cinema sitting in your seat your eyeball cinema sitting in your seat your eyeball is at the nodal point of the camera the is at the nodal point of the camera the is at the nodal point of the camera the nodal point in this example is not nodal point in this example is not nodal point in this example is not necessarily on the film plane of the necessarily on the film plane of the necessarily on the film plane of the camera it's not necessarily in the body camera it's not necessarily in the body camera it's not necessarily in the body of the camera it's usually at the modal of the camera it's usually at the modal of the camera it's usually at the modal point of the lens this is the point point of the lens this is the point point of the lens this is the point where your eye bill sits in the cinema where your eye bill sits in the cinema where your eye bill sits in the cinema the nodal point is most often with the the nodal point is most often with the the nodal point is most often with the prime lens Mir the iris ring we don't prime lens Mir the iris ring we don't prime lens Mir the iris ring we don't know exactly where it is at the moment know exactly where it is at the moment know exactly where it is at the moment we can prove later exactly where it is we can prove later exactly where it is we can prove later exactly where it is initially we're going to guess that the initially we're going to guess that the initially we're going to guess that the nodal point is on the axis of the lens nodal point is on the axis of the lens nodal point is on the axis of the lens and somewhere near the iris ring and somewhere near the iris ring and somewhere near the iris ring for this reason we can now take for this reason we can now take for this reason we can now take measurements of where that just nodal measurements of where that just nodal measurements of where that just nodal point is in order to tell Claire exactly point is in order to tell Claire exactly point is in order to tell Claire exactly where it is with respect to this point where it is with respect to this point where it is with respect to this point because the measurement of this point is because the measurement of this point is because the measurement of this point is what we are doing in order to tell us what we are doing in order to tell us what we are doing in order to tell us where this is because we are working where this is because we are working where this is because we are working here with a bolt stand alone our camera here with a bolt stand alone our camera here with a bolt stand alone our camera is top mounted this specifies exactly is top mounted this specifies exactly is top mounted this specifies exactly what becomes x y and z nodal objects with a top mounted camera this is X this with a top mounted camera this is X this is Z if I had a Milo with a rear mounted is Z if I had a Milo with a rear mounted is Z if I had a Milo with a rear mounted camera this would be it that would be camera this would be it that would be camera this would be it that would be yet our first measurement is of the X yet our first measurement is of the X yet our first measurement is of the X nodal offset here our X nodal offset is nodal offset here our X nodal offset is nodal offset here our X nodal offset is this distance it's the distance from this distance it's the distance from this distance it's the distance from this point on the metal down to the this point on the metal down to the this point on the metal down to the level of the lens here I'm measuring it level of the lens here I'm measuring it level of the lens here I'm measuring it as 25 centimeters so I can now put that as 25 centimeters so I can now put that as 25 centimeters so I can now put that measurement into by X nodal offset of measurement into by X nodal offset of measurement into by X nodal offset of course here which we're working in course here which we're working in course here which we're working in meters so that's 0.25 my Y nodal offset meters so that's 0.25 my Y nodal offset meters so that's 0.25 my Y nodal offset is a measurement across my lens in this is a measurement across my lens in this is a measurement across my lens in this particular case my lens is centered on the center of this axis the center of this axis because the camera has been centrally because the camera has been centrally because the camera has been centrally mounted so my y modal offset is zero and mounted so my y modal offset is zero and mounted so my y modal offset is zero and that is the figure I can put in here my that is the figure I can put in here my that is the figure I can put in here my Z modal offset I'm looking at a point Z modal offset I'm looking at a point Z modal offset I'm looking at a point somewhere here so I need to know the somewhere here so I need to know the somewhere here so I need to know the distance here to the center of my tilt distance here to the center of my tilt distance here to the center of my tilt from that point to there which I'm from that point to there which I'm from that point to there which I'm taking as 10 centimeters so I can put taking as 10 centimeters so I can put taking as 10 centimeters so I can put zero point one meters there so I've now zero point one meters there so I've now zero point one meters there so I've now put in my nodal offsets for these for put in my nodal offsets for these for put in my nodal offsets for these for this particular nodal point this this particular nodal point this this particular nodal point this measurement is still a guess but later I measurement is still a guess but later I measurement is still a guess but later I will prove exactly where it is there are will prove exactly where it is there are will prove exactly where it is there are other measurements I need to take to my other measurements I need to take to my other measurements I need to take to my measure offset is the distance from my measure offset is the distance from my measure offset is the distance from my measure hook to the film plane my measure hook to the film plane my measure hook to the film plane my measure hook is the point I hang my tape measure hook is the point I hang my tape measure hook is the point I hang my tape measure on when I'm measuring a target measure on when I'm measuring a target measure on when I'm measuring a target when I am measuring a target I will put when I am measuring a target I will put when I am measuring a target I will put my tape measure on the Mesa hook there my tape measure on the Mesa hook there my tape measure on the Mesa hook there and measure but I need to know where the and measure but I need to know where the and measure but I need to know where the measure hook is with respect to the film measure hook is with respect to the film measure hook is with respect to the film plane in this case the measure hook is plane in this case the measure hook is plane in this case the measure hook is on the film plane so therefore my on the film plane so therefore my on the film plane so therefore my measure offset is zero the next thing I measure offset is zero the next thing I measure offset is zero the next thing I need to know is where is my measure hook need to know is where is my measure hook need to know is where is my measure hook with respect to the center of the tilt with respect to the center of the tilt with respect to the center of the tilt this will vary according to how I mount this will vary according to how I mount this will vary according to how I mount my camera but here I'm looking at two my camera but here I'm looking at two my camera but here I'm looking at two and a half centimeters as being the and a half centimeters as being the and a half centimeters as being the measurement from my measure hook measurement from my measure hook measurement from my measure hook to the center of my kilt therefore I can to the center of my kilt therefore I can to the center of my kilt therefore I can put this figure in my measure optical put this figure in my measure optical put this figure in my measure optical offset 0.025 this set of measurements offset 0.025 this set of measurements offset 0.025 this set of measurements defines where my nodal point where my defines where my nodal point where my defines where my nodal point where my measure hook and the other factors measure hook and the other factors measure hook and the other factors involved are in order to define for involved are in order to define for involved are in order to define for flair exactly where my camera is and flair exactly where my camera is and flair exactly where my camera is and take XO accurate measurements I'm now take XO accurate measurements I'm now take XO accurate measurements I'm now going to save apply that is a completed going to save apply that is a completed going to save apply that is a completed lens setup now in my setup menu I have a lens setup now in my setup menu I have a lens setup now in my setup menu I have a Lin setup areata Prime 50 millimeter if Lin setup areata Prime 50 millimeter if Lin setup areata Prime 50 millimeter if I take that and save apply the I take that and save apply the I take that and save apply the customized focus information there is customized focus information there is customized focus information there is written into my focus and my focus is written into my focus and my focus is written into my focus and my focus is setup and when I measure my targets I setup and when I measure my targets I setup and when I measure my targets I know exactly where my lens is and where know exactly where my lens is and where know exactly where my lens is and where my target point is this is been a mark my target point is this is been a mark my target point is this is been a mark of a commercial control training video of a commercial control training video of a commercial control training video thank you for watching thank you for watching thank you for watching [Music]